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This reverts commit cf158e84.

Reason for revert: A converted test snav-media-elements.html becomes flaky

Original change's description:
> Snav: Convert some legacy js-tests to testharness - 2
> 
> Convert list:
> snav-display-contents-crash
> snav-div-in-anchor
> snav-fully-aligned-horizontally
> snav-fully-aligned-vertically
> snav-hidden-focusable-element
> snav-imagemap-area-not-focusable
> snav-imagemap-area-without-image
> snav-imagemap-overlapped-areas
> snav-imagemap-simple
> snav-media-elements
> 
> Bug: 803086
> 
> Change-Id: Iebe20bba5868fec1e1c38f2a188346432c42d568
> Reviewed-on: https://chromium-review.googlesource.com/1184945
> Reviewed-by: Hugo Holgersson <hugoh@vewd.com>
> Commit-Queue: JunHo Seo <junho0924.seo@lge.com>
> Cr-Commit-Position: refs/heads/master@{#585694}

TBR=kochi@chromium.org,szager@chromium.org,junho0924.seo@lge.com,hugoh@vewd.com

Change-Id: Id2448339f31a707ed9f6c769cd71dec0d500d11c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 803086
Reviewed-on: https://chromium-review.googlesource.com/1188262Reviewed-by: Hugo Holgersson <hugoh@vewd.com>
Commit-Queue: JunHo Seo <junho0924.seo@lge.com>
Cr-Commit-Position: refs/heads/master@{#585774}